forked from KolibriOS/kolibrios
898 lines
26 KiB
NASM
898 lines
26 KiB
NASM
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; pngerror.asm - stub functions for i/o and memory allocation
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; Last changed in libpng 1.6.24 [August 4, 2016]
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; Copyright (c) 1998-2002,2004,2006-2016 Glenn Randers-Pehrson
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; (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
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; (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
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; This code is released under the libpng license.
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; For conditions of distribution and use, see the disclaimer
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; and license in png.h
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; This file provides a location for all error handling. Users who
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; need special error handling are expected to write replacement functions
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; and use png_set_error_fn() to use those functions. See the instructions
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; at each function.
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; This function is called whenever there is a fatal error. This function
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; should not be changed. If there is a need to handle errors differently,
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; you should supply a replacement error function and use png_set_error_fn()
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; to replace the error function at run-time.
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;if PNG_ERROR_TEXT_SUPPORTED
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;void png_error(png_const_structrp png_ptr, charp error_message)
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;{
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if PNG_ERROR_NUMBERS_SUPPORTED eq 1
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; char msg[16];
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; if (png_ptr != NULL)
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; {
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; if ((png_ptr->flags &
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; (PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT)) != 0)
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; {
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; if (*error_message == PNG_LITERAL_SHARP)
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; {
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;Strip "#nnnn " from beginning of error message.
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; int offset;
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; for (offset = 1; offset<15; offset++)
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; if (error_message[offset] == ' ')
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; break;
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; if ((png_ptr->flags & PNG_FLAG_STRIP_ERROR_TEXT) != 0)
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; {
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; int i;
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; for (i = 0; i < offset - 1; i++)
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; msg[i] = error_message[i + 1];
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; msg[i - 1] = '\0';
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; error_message = msg;
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; }
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; else
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; error_message += offset;
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; }
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; else
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; {
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; if ((png_ptr->flags & PNG_FLAG_STRIP_ERROR_TEXT) != 0)
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; {
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; msg[0] = '0';
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; msg[1] = '\0';
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; error_message = msg;
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; }
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; }
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; }
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; }
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end if
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; if (png_ptr != NULL && png_ptr->error_fn != NULL)
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; (*(png_ptr->error_fn))(png_ptr, error_message);
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; If the custom handler doesn't exist, or if it returns,
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; use the default handler, which will not return.
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; png_default_error(png_ptr, error_message);
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;}
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;#else
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;void png_err(png_const_structrp png_ptr)
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;{
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; Prior to 1.5.2 the error_fn received a NULL pointer, expressed
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; erroneously as '\0', instead of the empty string "". This was
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; apparently an error, introduced in libpng-1.2.20, and png_default_error
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; will crash in this case.
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; if (png_ptr != NULL && png_ptr->error_fn != NULL)
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; (*(png_ptr->error_fn))(png_ptr, "");
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; If the custom handler doesn't exist, or if it returns,
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; use the default handler, which will not return.
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; png_default_error(png_ptr, "");
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;}
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;end if /* ERROR_TEXT */
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; Utility to safely appends strings to a buffer. This never errors out so
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; error checking is not required in the caller.
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;size_t (charp buffer, size_t bufsize, size_t pos, charp string)
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align 4
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proc png_safecat uses ebx ecx edi esi, buffer:dword, bufsize:dword, pos:dword, string:dword
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mov edi,[buffer]
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cmp edi,0
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je .end0
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mov ebx,[pos]
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mov ecx,[bufsize]
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cmp ebx,ecx
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jge .end0 ;if (..!=0 && ..<..)
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mov esi,[string]
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cmp esi,0
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je .end1 ;if (..!=0)
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dec ecx
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@@:
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cmp byte[esi],0
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je .end1
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cmp ebx,ecx
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jge .end1
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movsb
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inc ebx
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jmp @b
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align 4
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.end1:
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xor al,al
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stosb
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.end0:
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mov eax,ebx
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ret
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endp
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;#if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED)
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; Utility to dump an unsigned value into a buffer, given a start pointer and
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; and end pointer (which should point just *beyond* the end of the buffer!)
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; Returns the pointer to the start of the formatted string.
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;charp png_format_number(charp start, charp end, int format,
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; png_alloc_size_t number)
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;{
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; int count = 0; /* number of digits output */
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; int mincount = 1; /* minimum number required */
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; int output = 0; /* digit output (for the fixed point format) */
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; *--end = '\0';
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; /* This is written so that the loop always runs at least once, even with
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; * number zero.
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; while (end > start && (number != 0 || count < mincount))
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; {
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; char digits[] = "0123456789ABCDEF";
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; switch (format)
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; {
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; case PNG_NUMBER_FORMAT_fixed:
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; /* Needs five digits (the fraction) */
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; mincount = 5;
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; if (output != 0 || number % 10 != 0)
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; {
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; *--end = digits[number % 10];
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; output = 1;
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; }
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; number /= 10;
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; break;
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; case PNG_NUMBER_FORMAT_02u:
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; /* Expects at least 2 digits. */
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; mincount = 2;
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; /* FALL THROUGH */
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; case PNG_NUMBER_FORMAT_u:
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; *--end = digits[number % 10];
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; number /= 10;
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; break;
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; case PNG_NUMBER_FORMAT_02x:
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; /* This format expects at least two digits */
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; mincount = 2;
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; /* FALL THROUGH */
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; case PNG_NUMBER_FORMAT_x:
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; *--end = digits[number & 0xf];
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; number >>= 4;
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; break;
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; default: /* an error */
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; number = 0;
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; break;
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; }
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; Keep track of the number of digits added
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; ++count;
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; Float a fixed number here:
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; if ((format == PNG_NUMBER_FORMAT_fixed) && (count == 5) && (end > start))
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; {
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; End of the fraction, but maybe nothing was output? In that case
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; drop the decimal point. If the number is a true zero handle that
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; here.
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; if (output != 0)
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; *--end = '.';
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; else if (number == 0) /* and !output */
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; *--end = '0';
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; }
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; }
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; return end;
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;}
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;end if
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;if PNG_WARNINGS_SUPPORTED
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; This function is called whenever there is a non-fatal error. This function
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; should not be changed. If there is a need to handle warnings differently,
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; you should supply a replacement warning function and use
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; png_set_error_fn() to replace the warning function at run-time.
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;void png_warning(png_const_structrp png_ptr, charp warning_message)
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;{
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; int offset = 0;
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; if (png_ptr != NULL)
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; {
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if PNG_ERROR_NUMBERS_SUPPORTED eq 1
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; if ((png_ptr->flags &
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; (PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT)) != 0)
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end if
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; {
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; if (*warning_message == PNG_LITERAL_SHARP)
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; {
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; for (offset = 1; offset < 15; offset++)
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; if (warning_message[offset] == ' ')
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; break;
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; }
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; }
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; }
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; if (png_ptr != NULL && png_ptr->warning_fn != NULL)
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; (*(png_ptr->warning_fn))(png_ptr, warning_message + offset);
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; else
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; png_default_warning(png_ptr, warning_message + offset);
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;}
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; These functions support 'formatted' warning messages with up to
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; PNG_WARNING_PARAMETER_COUNT parameters. In the format string the parameter
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; is introduced by @<number>, where 'number' starts at 1. This follows the
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; standard established by X/Open for internationalizable error messages.
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;void
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;png_warning_parameter(png_warning_parameters p, int number,
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; charp string)
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;{
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; if (number > 0 && number <= PNG_WARNING_PARAMETER_COUNT)
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; (void)png_safecat(p[number-1], (sizeof p[number-1]), 0, string);
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;}
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;void
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;png_warning_parameter_unsigned(png_warning_parameters p, int number, int format,
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; png_alloc_size_t value)
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;{
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; char buffer[PNG_NUMBER_BUFFER_SIZE];
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; png_warning_parameter(p, number, PNG_FORMAT_NUMBER(buffer, format, value));
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;}
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;void (png_warning_parameters p, int number, int format, int_32 value)
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align 4
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proc png_warning_parameter_signed, p:dword, number:dword, format:dword, value:dword
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; png_alloc_size_t u;
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; charp str;
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; char buffer[PNG_NUMBER_BUFFER_SIZE];
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; Avoid overflow by doing the negate in a png_alloc_size_t:
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; u = (png_alloc_size_t)value;
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; if (value < 0)
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; u = ~u + 1;
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; str = PNG_FORMAT_NUMBER(buffer, format, u);
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; if (value < 0 && str > buffer)
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; *--str = '-';
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; png_warning_parameter(p, number, str);
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ret
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endp
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;void (png_const_structrp png_ptr, png_warning_parameters p, charp message)
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align 4
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proc png_formatted_warning, png_ptr:dword, p:dword, message:dword
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; The internal buffer is just 192 bytes - enough for all our messages,
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; overflow doesn't happen because this code checks! If someone figures
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; out how to send us a message longer than 192 bytes, all that will
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; happen is that the message will be truncated appropriately.
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; size_t i = 0; /* Index in the msg[] buffer: */
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; char msg[192];
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; Each iteration through the following loop writes at most one character
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; to msg[i++] then returns here to validate that there is still space for
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; the trailing '\0'. It may (in the case of a parameter) read more than
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; one character from message[]; it must check for '\0' and continue to the
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; test if it finds the end of string.
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; while (i<(sizeof msg)-1 && *message != '\0')
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; {
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; '@' at end of string is now just printed (previously it was skipped);
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; it is an error in the calling code to terminate the string with @.
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; if (p != NULL && *message == '@' && message[1] != '\0')
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; {
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; int parameter_char = *++message; /* Consume the '@' */
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; char valid_parameters[] = "123456789";
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; int parameter = 0;
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; Search for the parameter digit, the index in the string is the
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; parameter to use.
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; while (valid_parameters[parameter] != parameter_char &&
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; valid_parameters[parameter] != '\0')
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; ++parameter;
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; If the parameter digit is out of range it will just get printed.
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; if (parameter < PNG_WARNING_PARAMETER_COUNT)
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; {
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; Append this parameter
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; charp parm = p[parameter];
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; charp pend = p[parameter] + (sizeof p[parameter]);
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; No need to copy the trailing '\0' here, but there is no guarantee
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; that parm[] has been initialized, so there is no guarantee of a
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; trailing '\0':
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; while (i<(sizeof msg)-1 && *parm != '\0' && parm < pend)
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; msg[i++] = *parm++;
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; Consume the parameter digit too:
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; ++message;
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; continue;
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; }
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; else not a parameter and there is a character after the @ sign; just
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; copy that. This is known not to be '\0' because of the test above.
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; }
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; At this point *message can't be '\0', even in the bad parameter case
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; above where there is a lone '@' at the end of the message string.
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; msg[i++] = *message++;
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; }
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; i is always less than (sizeof msg), so:
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; msg[i] = '\0';
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; And this is the formatted message. It may be larger than
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; PNG_MAX_ERROR_TEXT, but that is only used for 'chunk' errors and these
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; are not (currently) formatted.
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; png_warning(png_ptr, msg);
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ret
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endp
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;end if /* WARNINGS */
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;void png_benign_error(png_const_structrp png_ptr, charp error_message)
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;{
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; if ((png_ptr->flags & PNG_FLAG_BENIGN_ERRORS_WARN) != 0)
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; {
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;# ifdef PNG_READ_SUPPORTED
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; if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0 &&
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; png_ptr->chunk_name != 0)
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; png_chunk_warning(png_ptr, error_message);
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; else
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;# endif
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; png_warning(png_ptr, error_message);
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; }
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; else
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; {
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;# ifdef PNG_READ_SUPPORTED
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; if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0 &&
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; png_ptr->chunk_name != 0)
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; png_chunk_error(png_ptr, error_message);
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; else
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;# endif
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; png_error(png_ptr, error_message);
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; }
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;}
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;void png_app_warning(png_const_structrp png_ptr, charp error_message)
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;{
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; if ((png_ptr->flags & PNG_FLAG_APP_WARNINGS_WARN) != 0)
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; png_warning(png_ptr, error_message);
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; else
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; png_error(png_ptr, error_message);
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;}
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;void (png_structrp png_ptr, charp error_message)
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align 4
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proc png_app_error uses eax edi, png_ptr:dword, error_message:dword
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mov edi,[png_ptr]
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mov eax,[edi+png_struct.flags]
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and eax,PNG_FLAG_APP_ERRORS_WARN
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cmp eax,0
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je @f ;if (..!=0)
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png_warning edi, [error_message]
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jmp .end0
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@@: ;else
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png_error edi, [error_message]
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.end0:
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ret
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endp
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PNG_MAX_ERROR_TEXT equ 196 ;Currently limited by profile_error in png.asm
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if (PNG_WARNINGS_SUPPORTED eq 1) | \
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((PNG_READ_SUPPORTED eq 1) & (PNG_ERROR_TEXT_SUPPORTED eq 1))
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; These utilities are used internally to build an error message that relates
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; to the current chunk. The chunk name comes from png_ptr->chunk_name,
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; which is used to prefix the message. The message is limited in length
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; to 63 bytes. The name characters are output as hex digits wrapped in []
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; if the character is invalid.
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;#define isnonalpha(c) ((c) < 65 || (c) > 122 || ((c) > 90 && (c) < 97))
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align 4
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png_digit db \ ;char[16]
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'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', \
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'A', 'B', 'C', 'D', 'E', 'F'
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;void (png_const_structrp png_ptr, charp buffer, charp error_message)
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align 4
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proc png_format_buffer, png_ptr:dword, buffer:dword, error_message:dword
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; uint_32 chunk_name = png_ptr->chunk_name;
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; int iout = 0, ishift = 24;
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; while (ishift >= 0)
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; {
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; int c = (int)(chunk_name >> ishift) & 0xff;
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; ishift -= 8;
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; if (isnonalpha(c) != 0)
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; {
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; buffer[iout++] = PNG_LITERAL_LEFT_SQUARE_BRACKET;
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; buffer[iout++] = png_digit[(c & 0xf0) >> 4];
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; buffer[iout++] = png_digit[c & 0x0f];
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; buffer[iout++] = PNG_LITERAL_RIGHT_SQUARE_BRACKET;
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; }
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; else
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; {
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; buffer[iout++] = (char)c;
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; }
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; }
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; if (error_message == NULL)
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; buffer[iout] = '\0';
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; else
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; {
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; int iin = 0;
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; buffer[iout++] = ':';
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; buffer[iout++] = ' ';
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; while (iin < PNG_MAX_ERROR_TEXT-1 && error_message[iin] != '\0')
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; buffer[iout++] = error_message[iin++];
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;iin < PNG_MAX_ERROR_TEXT, so the following is safe:
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; buffer[iout] = '\0';
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; }
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ret
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endp
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end if ;WARNINGS || ERROR_TEXT
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;void (png_const_structrp png_ptr, charp error_message)
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align 4
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proc png_chunk_error, png_ptr:dword, error_message:dword
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; char msg[18+PNG_MAX_ERROR_TEXT];
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; if (png_ptr == NULL)
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; png_error(png_ptr, error_message);
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; else
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; {
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; png_format_buffer(png_ptr, msg, error_message);
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; png_error(png_ptr, msg);
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; }
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ret
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endp
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;void (png_const_structrp png_ptr, charp warning_message)
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align 4
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proc png_chunk_warning, png_ptr:dword, warning_message:dword
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; char msg[18+PNG_MAX_ERROR_TEXT];
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; if (png_ptr == NULL)
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; png_warning(png_ptr, warning_message);
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; else
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; {
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; png_format_buffer(png_ptr, msg, warning_message);
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; png_warning(png_ptr, msg);
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; }
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ret
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endp
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;void (png_const_structrp png_ptr, charp error_message)
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align 4
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proc png_chunk_benign_error, png_ptr:dword, error_message:dword
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; if ((png_ptr->flags & PNG_FLAG_BENIGN_ERRORS_WARN) != 0)
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; png_chunk_warning(png_ptr, error_message);
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; else
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; png_chunk_error(png_ptr, error_message);
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ret
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endp
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|
|
;void (png_const_structrp png_ptr, charp message, int error)
|
|
align 4
|
|
proc png_chunk_report, png_ptr:dword, message:dword, error:dword
|
|
; This is always supported, but for just read or just write it
|
|
; unconditionally does the right thing.
|
|
|
|
;# if defined(PNG_READ_SUPPORTED) && defined(PNG_WRITE_SUPPORTED)
|
|
; if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0)
|
|
;# endif
|
|
|
|
if PNG_READ_SUPPORTED eq 1
|
|
; {
|
|
; if (error < PNG_CHUNK_ERROR)
|
|
; png_chunk_warning(png_ptr, message);
|
|
|
|
; else
|
|
; png_chunk_benign_error(png_ptr, message);
|
|
; }
|
|
end if
|
|
|
|
;# if defined(PNG_READ_SUPPORTED) && defined(PNG_WRITE_SUPPORTED)
|
|
; else if ((png_ptr->mode & PNG_IS_READ_STRUCT) == 0)
|
|
;# endif
|
|
|
|
if PNG_WRITE_SUPPORTED eq 1
|
|
; {
|
|
; if (error < PNG_CHUNK_WRITE_ERROR)
|
|
; png_app_warning(png_ptr, message);
|
|
;
|
|
; else
|
|
; png_app_error(png_ptr, message);
|
|
; }
|
|
end if
|
|
ret
|
|
endp
|
|
|
|
;void (png_const_structrp png_ptr, charp name)
|
|
align 4
|
|
proc png_fixed_error, png_ptr:dword, name:dword
|
|
;# define fixed_message "fixed point overflow in "
|
|
;# define fixed_message_ln ((sizeof fixed_message)-1)
|
|
; int iin;
|
|
; char msg[fixed_message_ln+PNG_MAX_ERROR_TEXT];
|
|
; memcpy(msg, fixed_message, fixed_message_ln);
|
|
; iin = 0;
|
|
; if (name != NULL)
|
|
; while (iin < (PNG_MAX_ERROR_TEXT-1) && name[iin] != 0)
|
|
; {
|
|
; msg[fixed_message_ln + iin] = name[iin];
|
|
; ++iin;
|
|
; }
|
|
; msg[fixed_message_ln + iin] = 0;
|
|
; png_error(png_ptr, msg);
|
|
ret
|
|
endp
|
|
|
|
; This API only exists if ANSI-C style error handling is used,
|
|
; otherwise it is necessary for png_default_error to be overridden.
|
|
|
|
;jmp_buf* (png_structrp png_ptr, png_longjmp_ptr longjmp_fn,
|
|
; size_t jmp_buf_size)
|
|
align 4
|
|
proc png_set_longjmp_fn, png_ptr:dword, longjmp_fn:dword, jmp_buf_size:dword
|
|
; From libpng 1.6.0 the app gets one chance to set a 'jmpbuf_size' value
|
|
; and it must not change after that. Libpng doesn't care how big the
|
|
; buffer is, just that it doesn't change.
|
|
|
|
; If the buffer size is no *larger* than the size of jmp_buf when libpng is
|
|
; compiled a built in jmp_buf is returned; this preserves the pre-1.6.0
|
|
; semantics that this call will not fail. If the size is larger, however,
|
|
; the buffer is allocated and this may fail, causing the function to return
|
|
; NULL.
|
|
|
|
; if (png_ptr == NULL)
|
|
; return NULL;
|
|
|
|
; if (png_ptr->jmp_buf_ptr == NULL)
|
|
; {
|
|
; png_ptr->jmp_buf_size = 0; /* not allocated */
|
|
|
|
; if (jmp_buf_size <= (sizeof png_ptr->jmp_buf_local))
|
|
; png_ptr->jmp_buf_ptr = &png_ptr->jmp_buf_local;
|
|
|
|
; else
|
|
; {
|
|
; png_ptr->jmp_buf_ptr = png_malloc_warn(png_ptr, jmp_buf_size);
|
|
|
|
; if (png_ptr->jmp_buf_ptr == NULL)
|
|
; return NULL; /* new NULL return on OOM */
|
|
|
|
; png_ptr->jmp_buf_size = jmp_buf_size;
|
|
; }
|
|
; }
|
|
|
|
; else /* Already allocated: check the size */
|
|
; {
|
|
; size_t size = png_ptr->jmp_buf_size;
|
|
|
|
; if (size == 0)
|
|
; {
|
|
; size = (sizeof png_ptr->jmp_buf_local);
|
|
; if (png_ptr->jmp_buf_ptr != &png_ptr->jmp_buf_local)
|
|
; {
|
|
; This is an internal error in libpng: somehow we have been left
|
|
; with a stack allocated jmp_buf when the application regained
|
|
; control. It's always possible to fix this up, but for the moment
|
|
; this is a png_error because that makes it easy to detect.
|
|
|
|
; png_error(png_ptr, "Libpng jmp_buf still allocated");
|
|
; /* png_ptr->jmp_buf_ptr = &png_ptr->jmp_buf_local; */
|
|
; }
|
|
; }
|
|
|
|
; if (size != jmp_buf_size)
|
|
; {
|
|
; png_warning(png_ptr, "Application jmp_buf size changed");
|
|
; return NULL; /* caller will probably crash: no choice here */
|
|
; }
|
|
; }
|
|
|
|
; Finally fill in the function, now we have a satisfactory buffer. It is
|
|
; valid to change the function on every call.
|
|
|
|
; png_ptr->longjmp_fn = longjmp_fn;
|
|
; return png_ptr->jmp_buf_ptr;
|
|
.end_f:
|
|
ret
|
|
endp
|
|
|
|
;void (png_structrp png_ptr)
|
|
align 4
|
|
proc png_free_jmpbuf, png_ptr:dword
|
|
; if (png_ptr != NULL)
|
|
; {
|
|
; jmp_buf *jb = png_ptr->jmp_buf_ptr;
|
|
|
|
; A size of 0 is used to indicate a local, stack, allocation of the
|
|
; pointer; used here and in png.c
|
|
|
|
; if (jb != NULL && png_ptr->jmp_buf_size > 0)
|
|
; {
|
|
|
|
; This stuff is so that a failure to free the error control structure
|
|
; does not leave libpng in a state with no valid error handling: the
|
|
; free always succeeds, if there is an error it gets ignored.
|
|
|
|
; if (jb != &png_ptr->jmp_buf_local)
|
|
; {
|
|
; /* Make an internal, libpng, jmp_buf to return here */
|
|
; jmp_buf free_jmp_buf;
|
|
|
|
; if (!setjmp(free_jmp_buf))
|
|
; {
|
|
; png_ptr->jmp_buf_ptr = &free_jmp_buf; /* come back here */
|
|
; png_ptr->jmp_buf_size = 0; /* stack allocation */
|
|
; png_ptr->longjmp_fn = longjmp;
|
|
; png_free(png_ptr, jb); /* Return to setjmp on error */
|
|
; }
|
|
; }
|
|
; }
|
|
|
|
; *Always* cancel everything out:
|
|
; png_ptr->jmp_buf_size = 0;
|
|
; png_ptr->jmp_buf_ptr = NULL;
|
|
; png_ptr->longjmp_fn = 0;
|
|
; }
|
|
ret
|
|
endp
|
|
|
|
; This is the default error handling function. Note that replacements for
|
|
; this function MUST NOT RETURN, or the program will likely crash. This
|
|
; function is used by default, or if the program supplies NULL for the
|
|
; error function pointer in png_set_error_fn().
|
|
|
|
;void (png_const_structrp png_ptr, charp error_message)
|
|
align 4
|
|
proc png_default_error, png_ptr:dword, error_message:dword
|
|
if PNG_CONSOLE_IO_SUPPORTED eq 1
|
|
if PNG_ERROR_NUMBERS_SUPPORTED eq 1
|
|
; Check on NULL only added in 1.5.4
|
|
; if (error_message != NULL && *error_message == PNG_LITERAL_SHARP)
|
|
; {
|
|
; Strip "#nnnn " from beginning of error message.
|
|
; int offset;
|
|
; char error_number[16];
|
|
; for (offset = 0; offset<15; offset++)
|
|
; {
|
|
; error_number[offset] = error_message[offset + 1];
|
|
; if (error_message[offset] == ' ')
|
|
; break;
|
|
; }
|
|
|
|
; if ((offset > 1) && (offset < 15))
|
|
; {
|
|
; error_number[offset - 1] = '\0';
|
|
; fprintf(stderr, "libpng error no. %s: %s",
|
|
; error_number, error_message + offset + 1);
|
|
; fprintf(stderr, PNG_STRING_NEWLINE);
|
|
; }
|
|
|
|
; else
|
|
; {
|
|
; fprintf(stderr, "libpng error: %s, offset=%d",
|
|
; error_message, offset);
|
|
; fprintf(stderr, PNG_STRING_NEWLINE);
|
|
; }
|
|
; }
|
|
; else
|
|
end if
|
|
; {
|
|
; fprintf(stderr, "libpng error: %s", error_message ? error_message :
|
|
; "undefined");
|
|
; fprintf(stderr, PNG_STRING_NEWLINE);
|
|
; }
|
|
end if
|
|
; png_longjmp(png_ptr, 1);
|
|
ret
|
|
endp
|
|
|
|
; This function is called when there is a warning, but the library thinks
|
|
; it can continue anyway. Replacement functions don't have to do anything
|
|
; here if you don't want them to. In the default configuration, png_ptr is
|
|
; not used, but it is passed in case it may be useful.
|
|
|
|
;void (png_const_structrp png_ptr, charp warning_message)
|
|
align 4
|
|
proc png_default_warning, png_ptr:dword, warning_message:dword
|
|
if PNG_CONSOLE_IO_SUPPORTED eq 1
|
|
if PNG_ERROR_NUMBERS_SUPPORTED eq 1
|
|
; if (*warning_message == PNG_LITERAL_SHARP)
|
|
; {
|
|
; int offset;
|
|
; char warning_number[16];
|
|
; for (offset = 0; offset < 15; offset++)
|
|
; {
|
|
; warning_number[offset] = warning_message[offset + 1];
|
|
; if (warning_message[offset] == ' ')
|
|
; break;
|
|
; }
|
|
|
|
; if ((offset > 1) && (offset < 15))
|
|
; {
|
|
; warning_number[offset + 1] = '\0';
|
|
; fprintf(stderr, "libpng warning no. %s: %s",
|
|
; warning_number, warning_message + offset);
|
|
; fprintf(stderr, PNG_STRING_NEWLINE);
|
|
; }
|
|
|
|
; else
|
|
; {
|
|
; fprintf(stderr, "libpng warning: %s",
|
|
; warning_message);
|
|
; fprintf(stderr, PNG_STRING_NEWLINE);
|
|
; }
|
|
; }
|
|
; else
|
|
end if
|
|
; {
|
|
; fprintf(stderr, "libpng warning: %s", warning_message);
|
|
; fprintf(stderr, PNG_STRING_NEWLINE);
|
|
; }
|
|
end if
|
|
ret
|
|
endp
|
|
|
|
; This function is called when the application wants to use another method
|
|
; of handling errors and warnings. Note that the error function MUST NOT
|
|
; return to the calling routine or serious problems will occur. The return
|
|
; method used in the default routine calls longjmp(png_ptr->jmp_buf_ptr, 1)
|
|
|
|
;void (png_structrp png_ptr, voidp error_ptr,
|
|
; png_error_ptr error_fn, png_error_ptr warning_fn)
|
|
align 4
|
|
proc png_set_error_fn, png_ptr:dword, error_ptr:dword, error_fn:dword, warning_fn:dword
|
|
; if (png_ptr == NULL)
|
|
; return;
|
|
|
|
; png_ptr->error_ptr = error_ptr;
|
|
; png_ptr->error_fn = error_fn;
|
|
if PNG_WARNINGS_SUPPORTED eq 1
|
|
; png_ptr->warning_fn = warning_fn;
|
|
end if
|
|
ret
|
|
endp
|
|
|
|
|
|
; This function returns a pointer to the error_ptr associated with the user
|
|
; functions. The application should free any memory associated with this
|
|
; pointer before png_write_destroy and png_read_destroy are called.
|
|
|
|
;voidp (png_const_structrp png_ptr)
|
|
align 4
|
|
proc png_get_error_ptr, png_ptr:dword
|
|
; if (png_ptr == NULL)
|
|
; return NULL;
|
|
|
|
; return ((voidp)png_ptr->error_ptr);
|
|
ret
|
|
endp
|
|
|
|
;void (png_structrp png_ptr, uint_32 strip_mode)
|
|
align 4
|
|
proc png_set_strip_error_numbers, png_ptr:dword, strip_mode:dword
|
|
; if (png_ptr != NULL)
|
|
; {
|
|
; png_ptr->flags &=
|
|
; ((~(PNG_FLAG_STRIP_ERROR_NUMBERS |
|
|
; PNG_FLAG_STRIP_ERROR_TEXT))&strip_mode);
|
|
; }
|
|
ret
|
|
endp
|
|
|
|
; Currently the above both depend on SETJMP_SUPPORTED, however it would be
|
|
; possible to implement without setjmp support just so long as there is some
|
|
; way to handle the error return here:
|
|
|
|
;void (png_structp png_nonconst_ptr, charp error_message)
|
|
align 4
|
|
proc png_safe_error uses eax ebx, png_nonconst_ptr:dword, error_message:dword
|
|
mov ebx,[png_nonconst_ptr]
|
|
mov ebx,[ebx+png_struct.error_ptr]
|
|
; An error is always logged here, overwriting anything (typically a warning)
|
|
; that is already there:
|
|
|
|
cmp ebx,0
|
|
je .end0 ;if (..!=0)
|
|
stdcall png_safecat, dword[ebx+png_image.message], sizeof.png_image.message, 0, [error_message]
|
|
or dword[ebx+png_image.warning_or_error], PNG_IMAGE_ERROR
|
|
|
|
; Retrieve the jmp_buf from within the png_control, making this work for
|
|
; C++ compilation too is pretty tricky: C++ wants a pointer to the first
|
|
; element of a jmp_buf, but C doesn't tell us the type of that.
|
|
|
|
; if (image->opaque != NULL && image->opaque->error_buf != NULL)
|
|
; longjmp(png_control_jmp_buf(image->opaque), 1);
|
|
|
|
; Missing longjmp buffer, the following is to help debugging:
|
|
; {
|
|
; size_t pos = png_safecat(image->message, (sizeof image->message), 0,
|
|
; "bad longjmp: ");
|
|
; png_safecat(image->message, (sizeof image->message), pos,
|
|
; error_message);
|
|
; }
|
|
.end0:
|
|
|
|
; Here on an internal programming error.
|
|
; abort();
|
|
ret
|
|
endp
|
|
|
|
;void (png_structp png_nonconst_ptr, charp warning_message)
|
|
align 4
|
|
proc png_safe_warning uses eax ebx, png_nonconst_ptr:dword, warning_message:dword
|
|
mov ebx,[png_nonconst_ptr]
|
|
mov ebx,[ebx+png_struct.error_ptr]
|
|
|
|
; A warning is only logged if there is no prior warning or error.
|
|
cmp dword[ebx+png_image.warning_or_error],0
|
|
jne @f ;if (..==0)
|
|
stdcall png_safecat, dword[ebx+png_image.message], sizeof.png_image.message, 0, [warning_message]
|
|
or dword[ebx+png_image.warning_or_error], PNG_IMAGE_WARNING
|
|
@@:
|
|
ret
|
|
endp
|
|
|
|
;int (png_imagep image_in, int (*function)(voidp), voidp arg)
|
|
align 4
|
|
proc png_safe_execute uses ebx, image_in:dword, function:dword, arg:dword
|
|
; volatile png_imagep image = image_in;
|
|
; volatile int result;
|
|
; volatile voidp saved_error_buf;
|
|
; jmp_buf safe_jmpbuf;
|
|
|
|
; Safely execute function(arg) with png_error returning to this function.
|
|
mov ebx,[image_in]
|
|
; saved_error_buf = image->opaque->error_buf;
|
|
; result = setjmp(safe_jmpbuf) == 0;
|
|
|
|
; if (result != 0)
|
|
; {
|
|
; image->opaque->error_buf = safe_jmpbuf;
|
|
stdcall [function], [arg]
|
|
; }
|
|
|
|
; image->opaque->error_buf = saved_error_buf;
|
|
|
|
; And do the cleanup prior to any failure return.
|
|
cmp eax,0
|
|
jne @f ;if (..==0)
|
|
stdcall png_image_free, ebx
|
|
@@:
|
|
ret
|
|
endp
|
|
|